Good evening guys! Thank you all for the replies! So much helpful information.
I watched a video of a guy making a 270 awning, on here. I noticed he used a silver heavy duty tarp for the awning. For me it is just the cost isn't bad. I looked at Canvas, but was under the impression it wasn't waterproof. I looked into the waxed canvas, this could be a very good option. After some of what was said here, $20 a yard for a material when 5-6 yards of material would do it, wouldn't be that much more than the tarps I was considering. My biggest issue, is waterproof seams. My ideas might get lots of laughs, but, I've always had to maximize my outcomes with as little cost as possible. I am resourceful, skilled, and creative... but, what ever I do, I want to do it well. Since I live in Michigan, I know just how brutal our storms can get during camping. I really don't want a leaky tent. The siver heavy duty tarps are coated in UV protective films usually. It was, at a moment, what I seen a couple others use. Making something that can handle the elements is important. I am willing to try anything if I can. As far as Tyvek, where I work, we use Tyvek PPE suits for our nasty chemical work. HCL, Sulfuric, Chrome and Etch.... nasty, nasty stuff. I might have to check into that. I looked at 2 dealers for waxed canvas, there were out of like everything! LOL.
BritKLR, I thank you for the link and your comments. That was a quick eye opener. I looked a bit into waxed canvas, It could work very well. How well does it handle rain? Can in with stand hours of down pours? Your work, is awesome, as is your information. I'll be checking more into this on my days off.
As for patterns, I don't have a pattern yet. My idea is pretty simple. Like most, my RTT will fold in half. The difference is that I was planning on solid sides at the ends. These would allow my material to be attached by using a "L" type trim to clamp the material against the sides of the ends. Some spots at folds, left loose with Velcro inside on the edges of the base. The rest also clamped, but snaps on the bottom. I don't want to give away my whole idea/design or I won't be able to have a interesting build log! Some people, will already visualize this. Yes, my tent will take a few minutes more to set up than those $3.5K fancy units... but, I am fine with that. Currently, other than material on my mind, is the end shapes.
Again, thank you all for the ideas and suggestions!